Extraction of low-molar-mass phenolics and lipophilic compounds from Pinus pinaster wood with compressed CO2 |
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Affiliation: | 1. CNRS, Laboratoire Réactions et Génie de Procédés, UMR 7274, 1 rue Grandville, BP 20451, 54001 Nancy, France;2. Université de Lorraine, Laboratoire Réactions et Génie de Procédés, UMR 7274, 1 rue Grandville, BP 20451, 54001 Nancy, France;3. Laboratoire d''Electrochimie et de Physicochimie des Matériaux et des Interfaces, UMR 5279, CNRS/Grenoble-INP/Université de Savoie/Université Joseph Fourrier, 1130 rue de la Piscine, 38402 Saint-Martin d''Hères, France |
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Abstract: | Near-supercritical and supercritical CO2 was used to extract low-molar-mass phenolics and lipophilic compounds from Pinus pinaster wood. Extraction of samples containing sapwood and knotwood was carried out at 10?25 MPa and 30?50 °C to assess the influence of the operational conditions on the yields of total extracts and phenolics, as well as on the radical scavenging capacity of extracts. The use of ethanol as a co-solvent increased both the extraction yields and the concentration of phenolics in extracts. Operating under selected conditions (25 MPa, 50 °C, 10% ethanol), the extraction yield accounted for 4.1 wt% of the oven-dry wood. The extracts contained up to 7.6 g of phenolic compounds (measured as gallic acid equivalents) per 100 g extract, and showed one third of the radical scavenging capacity of Trolox. Native resin acids accounted for about 24 g per 100 g extracts, whereas flavonoids, lignans, stilbenes and juvabiones were found at lower proportions. |
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Keywords: | Phenolic compounds Lipophilic compounds Radical scavenging |
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